The producer Hot Sugar has been making tons of tracks for rappers from the Tumblr-rap underground. And on his track “Mama, I’m A Man,” he rounds up three of that scene’s most impressive talents — Antwon, of San Jose, and Lakutis and Big Baby Gandhi, of Queens — and lets all of them get playfully nasty. The song goes, and its video, which Hot Sugar directed himself, consists of nothing but these three guys rapping on escalators. You might be surprised at how much charisma these guys can display while on escalators. It’s below.